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THE SILICON AND CALCIUM HIGH-VELOCITY FEATURES IN TYPE Ia SUPERNOVAE FROM EARLY TO MAXIMUM PHASES
Zhao, XL1,2; Wang, XF1; Maeda, K2,3; Sai, H1; Zhang, TM4; Zhang JJ(张居甲)5,6; Huang, F1,7; Rui, LM1; Zhou, Q1; Mo, J1; Zhao, XL (reprint author), Tsinghua Univ, Dept Phys, Ctr Astrophys, Beijing 100084, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2015-09
卷号220期号:1
DOI10.1088/0067-0049/220/1/20
产权排序第5完成单位
收录类别SCI
关键词Methods: Data Analysis Supernovae: General Techniques: Spectroscopic
摘要The high-velocity features (HVFs) in optical spectra of type Ia supernovae (SNe Ia) are examined with a large sample including very early-time spectra (e.g., t < -7 days). Multiple Gaussian fits are applied to examine the HVFs and their evolutions, using constraints on expansion velocities for the same species (i.e., Si II 5972 and Si II 6355). We find that strong HVFs tend to appear in SNe Ia with smaller decline rates (e.g., Delta m(15)(B) less than or similar to 1.4 mag), clarifying that the finding by Childress et al. for the Ca-HVFs in near-maximum-light spectra applies both to the SiHVFs and Ca-HVFs in the earlier phase. The Si-HVFs seem to be more common in rapidly expanding SNe Ia, which is different from the earlier result that Ca-HVFs are associated with SNe Ia that have slower Si II 6355 velocities at maximum light (i.e., V-max(Si)). Moreover, SNe Ia with both stronger HVFs at early phases and larger V-max(Si) are found to have noticeably redder B - V colors and to occur preferentially in the inner regions of their host galaxies, while those with stronger HVFs but smaller V-max(Si) show opposite tendencies, suggesting that these two subclasses have different explosion environments and their HVFs may have different origins. We further examine the relationships between the absorption features of Si II 6355 and Ca II IR lines, and find that their photospheric components are well correlated in velocity and strength but that the corresponding HVFs show larger scatter. These results cannot be explained with ionization and/or thermal processes alone, and different mechanisms are required for the creation of HVF-forming regions in SNe Ia.
项目资助者Major State Basic Research Development Program [2013CB834903] ; National Natural Science Foundation of China (NSFC) [11178003, 11325313] ; China Scholarship Council (CSC) [201406210312] ; Chinese Academy of Sciences [XDB09000000] ; JSPS [26800100] ; World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan ; People's Government of Yunnan Province ; US National Science Foundation [AST 0907903] ; CAS
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0067-0049
URL查看原文
WOS记录号WOS:000364049900020
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]DELAYED-DETONATION MODELS ; PHOTOMETRY DATA RELEASE ; WHITE-DWARF MODELS ; BVRI LIGHT CURVES ; SN 2011FE ; CIRCUMSTELLAR MATERIAL ; SPECTROSCOPIC DIVERSITY ; OPTICAL SPECTROSCOPY ; 3-DIMENSIONAL MODELS ; INFRARED PHOTOMETRY
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5457
专题丽江天文观测站(南方基地)
中国科学院天体结构与演化重点实验室
通讯作者Zhao, XL (reprint author), Tsinghua Univ, Dept Phys, Ctr Astrophys, Beijing 100084, Peoples R China.
作者单位1.Center for Astrophysics, Department of Physics, Tsinghua University, Beijing, 100084, China
2.Department of Astronomy, Kyoto University, Kyoto, 606-8502, Japan
3.Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583, Japan
4.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
5.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China
6.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, China
7.Department of Astronomy, Beijing Normal University, Beijing 100875, China
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Zhao, XL,Wang, XF,Maeda, K,et al. THE SILICON AND CALCIUM HIGH-VELOCITY FEATURES IN TYPE Ia SUPERNOVAE FROM EARLY TO MAXIMUM PHASES[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2015,220(1).
APA Zhao, XL.,Wang, XF.,Maeda, K.,Sai, H.,Zhang, TM.,...&Zhao, XL .(2015).THE SILICON AND CALCIUM HIGH-VELOCITY FEATURES IN TYPE Ia SUPERNOVAE FROM EARLY TO MAXIMUM PHASES.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,220(1).
MLA Zhao, XL,et al."THE SILICON AND CALCIUM HIGH-VELOCITY FEATURES IN TYPE Ia SUPERNOVAE FROM EARLY TO MAXIMUM PHASES".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 220.1(2015).
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